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        <td class="header">FU Classification - Algorithm Specification</td>
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<h3>Introduction</h3>
<p>This algorithm is used for deriving the hue angle and FU (Forel-Ule) value from remote sensing reflectance. The data is used
    with the weighted linear sum of the remote sensing reflectance in which visual bands plus a correction term
    for the specific band-setting of each instrument. The algorithm is validated by a set of 603 hyperspectral
    measurements from inland, coastal and near-ocean waters.
    The processor supports the the following sensors:</p>
<ul>
    <li>Sentinel-3 OLCI Level2 W(F/R)R</li>
    <li>Sentinel-2 MSI L1C</li>
    <li>MERIS L2</li>
    <li>MODIS (1km LAC OC), MODIS-500 (M[O|Y]D09)</li>
    <li>SeaWiFS</li>
    <li>CZCS</li>
</ul>
<p>The algorithm is described in the following articles which are available online.</p>

<dl>
    <dt>Extending the derivation of the hue angle to more instruments.</dt>
    <dd>
        <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
            <param name="content" value="http://www.mdpi.com/2072-4292/10/2/180">
            <param name="text" value="Van der Woerd, H.J., Wernand, M.R, 2018.
                   Hue-Angle Product for Low to Medium Spatial Resolution Optical Satellite Sensors (http://dx.doi.org/10.3390/rs10020180)">
        </object>
    </dd>

    <dt>The derivation of the hue angle for the instruments SeaWiFS, MODIS, MERIS and OLCI are described in:</dt>
    <dd>
        <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
            <param name="content" value="http://www.mdpi.com/1424-8220/15/10/25663">
            <param name="text" value="Van der Woerd, H.J., Wernand, M.R., 2015. True colour classification of natural
    waters with medium-spectral resolution satellites: SeaWiFS, MODIS, MERIS and OLCI. Sensors 15, 25663-25680. doi:
    10.3339/s151025663 (Open Access)">
        </object>
    </dd>

    <dt>The conversion of the hue angle to the Forel-Ule number and the corresponding colour legend is based on:</dt>
    <dd>
        <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
            <param name="content" value="http://www.jeos.org/index.php/jeos_rp/article/view/13057">
            <param name="text" value="Novoa, S., Wernand, M.R, Van der Woerd, H.J., 2013. The Forel-Ule scale revisited
    spectrally: preparation protocols, transmission measurements and chromaticity. JEOS RP 8, 13057.
    DOI: http://dx.doi.org/10.2971/jeos.2013.13057 (Open Access)">
        </object>
    </dd>

    <dt>This algorithm connects satellite ocean colour observations to historical in-situ colour observations:</dt>
    <dd>
        <object classid="java:org.netbeans.modules.javahelp.BrowserDisplayer">
            <param name="content" value="http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0063766">
            <param name="text" value="Wernand, M.R, Van der Woerd, H.J., Gieskes. W.W.C, 2013. Trends in ocean colour and
    chlorophyll concentration from 1889 to present. Plos One. http://dx.plos.org/10.1371/journal.pone0063766 (open access)">
        </object>
    </dd>
</dl>

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